Electron discharge device employing cavity resonator apparatus



C. A. ROSENCRAN S ELEGTRON DISCHARGE DEVICE EMPLOYING CAVITYRESONATOR APPARATUS Filed Feb. 17, 1945 INVENToR. .5l/anus A. ,Qui/wenns irme/VFY Patented Oct. 12, 1948 ELECTRON DISCHARGE DEVICE EMPLOY- ING CAVITY RESONATOR APPARATUS Charles A. Rosencrans, Haddonfield, N. J., assignor to Radio Corporation of America, a corporation of Delaware Application February 17, 1945, Serial No. 578,467

Claims.

My invention relates to electron discharge devices and associated circuits useiul at ultra high frequencies and more particularly to such devices utilizing cavity resonators.

It is an object of my invention to provide an electron discharge device and associated circuit of the cavity resonator type in which the circuit is readily tunable and in which feedback between output and input can be easily controlled so that the apparatus may be used as an oscillator or as an amplifier.

It is another object of my invention to provide such a device in which the feedback controlling means is of novel and simple design.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims, but the invention itself will best be understood by reference to the following description taken in connection with the accompanying drawing in which Figure l is a longitudinal section showing an electron discharge device and associated cavity resonator made according to my invention, Figure 2 is a plan view of Figure 1, Figure 3 is a section taken along the line 3-3 of Figure l, Figure 4 is a section taken along the line 4--4 of Figure l, and Figure 5 is an equivalent circuit diagram of the apparatus shown in Figures 1 to 4, inclusive.

According to my invention I use an electron discharge device having at one end Iii, a cathode (not shown) and at the other end Il an anode with an intermediate grid having a grid contact ring I2, the electrodes being spaced in insulating relationship by means of the envelope of the tube.

In accordance with my invention I employ cavity resonator circuits. These may be formed by utilizing a box-shaped hollow conducting member I3 provided with an intermediate partition I4, the top and bottom of the member I3 and the partition being provided with apertures through which the electron discharge device may extend. An input4 cavity resonator I'5 is thus provided between the cathode and grid, and output cavity resonator I5 between the grid and the anode, each of these being tuned by plunger members I8 and I9 in the form of slides which vary the size of the internal cavity coupled between the various electrodes. In the arrangement shown, the anode II is capacity coupled through insulating ring II to the top of the hollow conducting member I3 and the cathode capa-city coupled through the insulating ring ID', the grid being directly connected to the partition I4 by means of spring Contact members I'I.

At one end of the resonator, oppositely disposed to the tuning elements I8 and I9, each of the resonators is provided with a longitudinally extending aperture such as 22 in the anode-grid cavity and the aperture 23 in the cathode-grid cavity to permit feedback and proper tuning. The partition I4 is hollow and comprises two sections 20 and 2i spaced from each other for purposes to be described.

In accordance with my invention, telescoped over one end of the hollow conducting member I3 is the conducting sleeve 24 provided with an intermediate partition 25 spaced at one end from the walls of the sleeve to provide an opening 26. Thus the interior of the output resonator I6 is coupled through the aperture 22 to what amounts to a transmission line formed by the conducting sleeve, radio frequency energy passing through aperture 22, around partition 25, back through the aperture 23, into the grid-cathode space. The phase relationship of the energy fed back is determined by the distance travelled by the energy from aperture 22 to aperture 23. This distance can be varied by varying the amount the sleeve is telescoped over the hollow resonator member I3. The partition 25 may in some cases be removed.

The equivalent circuit diagram is shown in Figure 5. Like numbers indicate like parts as in other figures. y

While I have indicated the preferred embodiments of my invention of which I am now aware and have also indicated only one specific application for which my invention may be employed, it will be apparent that my invention is by no means limited to the exact forms illustrated or the'use indicated, but that many variations may be made in the particular structure used and the purpose for which it is employed without departing from the scope of my invention as set forth in the appended claims.

What I claim as new is:

1. An electron discharge device having a cathode, grid and anode, and a resonator device for said electron discharge device including a hollow conducting elongated member having one side coupled to said cathode and the other side coupled to said anode, and a partition extending through said hollow conducting member longitudinally thereof whereby two resonant chambers are provided, and electrical connections between said grid and said partition, said hollow conducting member having adjacent apertures opening into said chambers, and hollow conducting means telescoped with said hollow conducting member and provided with a partition, said partition providing an opening between opposite sides of said hollow conducting means.

2. VAn electron discharge device having a cathode, grid and anode, a resonator device for said electron discharge device and including a hollow ilat elongated conductingA` member of rectangularconnected to said grid and providingtwo resonant chambers, one end of said hollowl conducting member having apertures opening into each of said chambers, said partitionzhavinga:portion in-i cluding spaced walls and a hollow conducting means telescoped over said hollow conductingmember over the portion; provided with said apertures. ,said tel'escoped' conductingy means having alpartitionextendingithereacrossfoitdividingsaid conducting means inta two; cor*r1-partments,A said last; partitionproviding a; passagewewv between saidr compartments, sai-dilast partition beingyree ceivedv between the walls. off said partit-ion within` said; conducting,- member, saidf conducting means being movable with respeotztcsaid; hollow con@ diir;1,-i-ngy member for. controlling; Feedback; from one. off said chambers. to the otherV of said;chain.,-` bers;

3-. Aneelectron discharge devicehavingfaacathode. grid and anode, a resonator device for; said electrcriv disch-arge device andt including`A a hollow conducting member,I one; side of said:v hollow con,- ducting member being coupled to.. said.y cathode andthe other side to said anode, a conducting partition extending: longitudinally of saidhollow conductingmember. andgthreugh; whichssa-id; elecf tron, discharge device extendsy and electrically connectedtQ- said grid, saldi pz'irtition-A providing two., chambers, one end; ot said; hollow conducting member ,having4A apertures: opening into eachA .of said, chambers, a hollow conductingmeans tele,-

scoped over said hollow conductirig member over the end provided with said apertures, said-.telegscoped conducting means; havinga partition; extending; thereacross` for dividing said conducting means into two compartments, said last partition providingv a. passageway between.. said compartf 1 ments, said hollow conducting means fbei-ngmovable,- with respect, to, saidhollowconducting memhen for controlling` feedback: from: one of saidchambers tc they other of said. chambers, and

means;y within said chambers for tuning: said n 55 UNITED STATES, EA'I'EJQIJSv chambers,

4.` An electron discharggeidevice havinga .cath. ode, grid and anode,v a resonator device for. said electron discharge device and including a hollow 'at elongated conducting member of rectangular transverse section, one side of said' hollow ccnducting member being coupled to saidgcathode and the other side to said anode, a conducting parti-- tion extending longitudinally of said hollow conducting member and through which said electron discharge device extends and electrically connected to said grid and dividing said hollow conducting member intotwo chambers, one end ofsaid hollow conducting member-having apertures opening into each of said chambers, said rlpartition having a portion including spaced walls lovend, a. hollow conducting means telescoped over said; hollow conducting member over'the portion provided with said apertures, said telescoped conductingv means;l having a partition extending thereacross for dividing said member in to two compartments, said last partition defining a pase sageway between said compartments, said last partition being received between the walls of'said Y partition within said hollow conducting mem'- ber, said hollow condueting means being ymovable witharespect-toysaidhollow conducting-111cmberY fcrcontrollingyfeedback fromv one of said cham-bers; to theV other Vof said chambers, and means within each of said chambersvfor-separatei-y tuning: saidi chambers; Y 5. du` electronl discharge device having acathode, grid andv anode, a resonator device for said electrony discharge t device-v andincluding a hollow conductingimember, one side of said hollow conff ducting member being coupled to said cathode and the other side to said anode, ak conducting partitionv extending: longgi-tudinal-ly` of said"hol lowV conducting member-'and through which said electron discharge device-extends and electrically` Y i connected to', said-v grid; and providing.r two1v chambers, one end.- ofsaidhollow'conductingVy member having restricted; apertures openin-g'inteeachrof said: chambers; an elongated.:t hol-lowconducting means telescoped.-1 oversaid hollow Icorntlucting Y :i member over the portion.. provided; with said 40 apertures,

said telescopedhollow conducting means having; a partition secured; thereto, and bei-ngE movable with respect toY said;E hollow conducting memberfor controllingfenergy feedback from one` of saidv cl'iambers'.-to the other of. said is chambers, the phase relationship of the energy fed baclr` beingA determinedfbyE the distance traveled by sai-d; energy between` said restricted` aper-V tures.

- CHARLES: A. ROSENCRANS;

REEERENGES v. CITED,

Thev followingY references are ofirecord in 'the le or this patent:

Whinnery^- July 1'6, 1946' 

